When inserting an image via "Insert/edit image", it is stored in the note as
<p><img src="../../../remote.php/webdav/ThomasKlassentrefffen_20150627_cut.jpg" alt="Description" width="100" height="85" /></p>
Unfortunately, that disables offline editing of the note
If the linked file gets moved/renamed/deleted you end up with an empty frame (sorry, can't upload screenshot...)
I know its probably by design BUT :-)
When inserting an image via "Insert/edit image", it is stored in the note as
<p><img src="../../../remote.php/webdav/ThomasKlassentrefffen_20150627_cut.jpg" alt="Description" width="100" height="85" /></p>